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PATENTBD MAY 17, 1853 R. MONTGOMERY. CORRUGATED PLATE FOR STEAM BOILERS.

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v R.MONTGGMERY. I CORRUGATED PLATE FOR STEAM BOILERS.

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UNITED STATES PATENT OFFICE.

' RICHARD MONTGOMERY, OF NEW YORK, N. Y., ASSIGNOR TO ELIZABETH MONTGOMERY.

CORRUGATED PLATE FOR STEAM-BOILERS, 8w.

Specification of Letters Patent No. 9,738, dated May 17, 1853.

To all whom it may concern:

Be it known that I, RICHARD MONTGOM- ERY, of the city, county, and State of New York, have invented a new and useful metal plate, in part plane and in part corrugated and of variable thickness, applicable to the construction of safes, steam-boilers, and to other purposes, of which the following is a full and exact description, reference being had to the accompanying drawings, which form part of the specification, and in which Figure 1 represents a plan, and Fig. 2 a transverse section, of one of my new boiler plates with a series of rivet holes punched in its margin; Fig. 3 a plan of a plate with its edges upset preparatory to corrugating its middle; and Fig. 4 a transverse section of the same.

My invention and improvement consists in making a plate of metal, with a margin on its edges, wide enough for the rivet holes, thick, and flat, and its middle or that portion included within the margin thinner, but corrugated to render it stiff, the depth of the folds of the corrugation being inversely proportioned to the thickness of the middle, so that to whatever degree it may be reduced it will still have the requisite degree of lateral strength imparted to it by the corrugation.

The accompanying drawing in Figs. 1 and 2 represents the margin (A) of the plate in this instance of about double the thickness of the middle (B) which is extended to double its original linear dimensions in the direction of the arrow (0), while the depth of the folds of the corrugations is such, that the plate notwithstanding its attenuation will possess much greater lateral stiffness, than it would have done if left fiat and of the thickness of the margin. The plate is extended but-little in the direction of the length of the folds of the corrugations, and this is compensated, by the protrusion of the ends (6) of the folds. The folds are thus made, and the margin left flat by a pair of fluted rolls, those parts of whose peripheries which perform the operation of shaping the plate, if developed on a fiat surface would respectively be the counterparts in position and shape of the two sides of the finished plate. For convenience, the rolls should be made of such diameter, that from one half to three fourths only of their peripheries would be equal to the length of the plate to be shaped, so that the time occupied in turning over the rolls the remainder of their peripheries will give an opportunity to insert the plates to be shaped between them. Those portions of the peripheries of the rolls, which correspond to the corrugations are fluted, the flutes of one roller being the counterpart of those of the other, the part corresponding to the side margins (1, 1,) of the plate, are narrow strips, concentric with the axis of the rolls, and of a width corresponding to that of the margins, while the parts which correspond to the end margins (2, 2,) are also concentrio to the axis, and equidistant therefrom with the strips, which shape the side margins (1, 1,) but at right angles with the latter on the face of the rolls. The two surfaces of the rolls thus formed are each the counterpart of the other, and their point of nearest approximation which is in the plane which passes through their axis, leaves a space of the proper thickness, and shape for the plate.

The plate should be made white or welding hot preparatory to introducing it between the rolls and then in case no flaws exist in the original plate, the finished plate will be perfectly sound, but if it has any hidden defect, the corrugating it will be certain to develop it, so that by this process of manufacture, not only does the plate receive the proper shape but its soundness is also effectually tested. A pair of rolls that could with advantage be employed for the manufacture of these plates, is described in the patent granted to me on the fifth day of February 1850.

The margins of each plate can be upset to any required thickness by first heating and then passing them in succession between three rolls two of which to feed and clamp the plate, and the third to upset the edge. Or a plate may be heated to a suitable heat and then clamped in a vise with one edge protruding as far as it is desired to upset it, and then it may be upset by compression, or by a drop punch or swage, or a clamp may be made in two parts which will clamp between them so much of the middle of the plate as is not required to be upset, and allowing the parts which are to be upset to project into a groove of a width equal to the thickness to which it is required to upset the margin of the plate, and then forcing either by pressure or percussion a swage or followerthat fits the groove down upon the edge to compress it down until it fills the groove, each edge is in like manner" com'' pressed into the groove to increaseits thickness and at the same time give it asym:

metrical shape.- In this Way the margins may be made if required four, five, or more times the thickness ofthe middle of the plate. 7 1 I do. not confine myself to the shaping of this plate in the precise manner I have specified, but leave it tothe constructor to make such changes in this part of the process, as his judgment and experience maysuggestm The thick fiat margins of plates, When riveted together givegreat stiffness to the -thickness of the middle of the plate, a'ndacorresponding increase of its surface, add greatly'to its capacity to transmitthe. heat from fireor flame on one side of it,to a

joint and furnish a firm basis on which to j head down the rivets. The reduction in 'of angle' iron for stiffening.

liquid on ,its opposite side. IMoreov e'r the great comparative thickness of the lates at the baseof the rivets, operates asv a rame to stiffen, strengthen, an'd keepinplace, a se- V 1 Way, dispensing in many cases With theuse The-plates may 'be bent'into any required shape either in the process of 'corrugating,

or subsequently, to adapt them'to rectangue lar, circular, or otherstructures. "T r What I claim as my invention and desire to. secure by L'etters Patent f The corrugated metal plate as herein de .j scribed with fia-t marginsof greater thick- 1 ness than its middle. I Intestimony whereof," I have hereunto vsub'scribed'my name. l

. V -R. MoN frGO ERYQ I Witnesses 2;

P. H. WATSON, I. S. SMITH,

'ries of theplates'riveted together, infthis" 

